The Sacramento County Sheriff's Department is actively investigating new leads that could lead to information on the "Golden State Killer."

The identity of the man believed responsible for 12 homicides, 45 rapes and dozens of burglaries from years 1976 to 1986 is still unknown.

His other nicknames included "The Original Night Stalker" and the "East Area Rapist." Several of the attacks occurred in Goleta. Four people in Santa Barbara County were murdered.

According to the Santa Barbara County Sheriff's Office, 44-year-old surgeon Dr. Robert Offerman and 35-year-old Alexandria Manning were murdered in their apartment on December 30, 1979. By that time, the killer became known to the area as "The Original Night Stalker."

About 18 months later, on July 26, 1981, tragedy struck again when 35-year-old Cheri Domingo and 27-year-old Gregory Sanchez were killed in a home on Toltec Way, where they were house sitting.

Sacramento County Sheriff's Department officials are looking for anyone with knowledge of a person who arrived at American River Hospital at 11:47 a.m. on May 30, 1977. The hospital is now closed.

Detectives say the patient was suspected of being the "Golden State Killer" by staff, who contacted authorities. The suspect ran away before deputies could arrive.

(Courtesy FBI)

Investigators say the patient used a stolen union identification card from the Local 17 Warehouseman's union that was in a wallet taken from an incident two years prior. Information provided on the hospital forms was found to be fictitious.

"It is conjectured that if the individual who sought treatment was the East Area Rapist, he may have suffered an injury related to his escape from the sexual assault of a couple on May 28, 1977. The rapist jumped a fence into a very steep canal where avoiding injury would be difficult in the dark," said Sgt. Shaun Hampton of the Sacramento County Sheriff's Department.

The sexual assault preceded a 13-week break in the rape series and an 18-week break in attacks in Sacramento.

Detectives are also looking for anyone with knowledge of a particular patient at the now-closed Bay Area Union Professional Center, located in Carmichael, CA. Detectives visited the optical center to identify a subject from a pair of prescription lenses dropped at the scene of a burglary in 1973.

"The burglary victims stated detectives advised them they had been able to identify a possible suspect in the case from the lens prescription and description of the suspect. It doesn’t appear any case was filed, nor arrest made, and the identity of the optical patient they identified is unknown," said Sgt. Hampton.

Authorities said in 2016 that if the killer is still alive, he would be between 60 and 75 years old. At the time of the crimes, he was described as having light brown or blonde hair and being close to six feet tall with an athletic build. The FBI also believes he may have had an interest in the military, or had some military training, leaving him familiar and proficient with firearms.

The FBI encourages anyone who knows anything about this man or the crimes committed to call 1-800-CALL-FBI or visit tips.FBI.gov to submit information.

For more details on the numerous cases revolving around the Golden State Killer, visit: FBI.gov/Sacramento.